I have a ’92 400e with about 130K miles on the odo. After a recent 200 mile drive and an overnight rest, it started making a very bad sound from the engine along the midline. The noise started right at startup.

I tried to post an audio of the noise but the forum regulations don’t permit the iPhone audio file type.

The top guesses are that the noise may be due to a failing wrist pin or rod bearing.

Other than this issue, the engine was in great shape, used 0 measurable oil between 5,000 mile oil/filter changes with Mobile 1 synth. Has had this oil type and change and frequency since new.

Some I’ve spoken with suggest replacing the engine. After doing some shopping I found a rebuilt long block for about $2K and a local indy said he’d do the swap/build for $2.5K + parts.

I like the car and couldn’t replace it for the cost of the suggested replacement. Don’t know if I should have someone troubleshoot to find the source and then fix it, or rebuild or replace.

Comments?

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